Numbers with digits 2 and 8 only.

Terms

a(0) =2a(1) =8a(2) =22a(3) =28a(4) =82a(5) =88a(6) =222a(7) =228a(8) =282a(9) =288a(10) =822a(11) =828a(12) =882a(13) =888a(14) =2222a(15) =2228a(16) =2282a(17) =2288a(18) =2822a(19) =2828a(20) =2882a(21) =2888a(22) =8222a(23) =8228a(24) =8282a(25) =8288a(26) =8822a(27) =8828a(28) =8882a(29) =8888